Thermic telephone.



PIETER DE LANGE L ROBERT AERNOUT BARON VANLYNDEN.

- THERMIC ELEPHONE. APPLICATION FILED Nov. 4. |915.

- pNrrED srnrns PATE Fire.

- PIETER DE LANGE AND ROBERT AERNOUT BARON VAN LYNDEN, OF UTRECHT,NETHER- LANDS, ASSIGNORS T NAAIVILOOZE VENNOOTSCHAP DE NEDERLANDSCHETHERMIQ-A TELEPHOON MAATSCHAPPIJ', 0F UTRECHT, NETHERLANDS, ACORPORATION OF NETHERLANDS.

i THERMIC TELEPHONE.

Applicationl filed November 4, 1915. Serial No.'59,622.

T0 all whom it may concern: Be itknown that' we, PIETER nn LANGE andROBERT AERNOUT BARON VAN LYNDEN,

Thermic Tele hone,

1, Fig. 3 illustratesV inl elevation, partly in Y both subjects 'of ltheQueen of the Netherlands, and residing at Utrecht, in the Netherlands,have invented' a new and useful of which the following isa-speci cation.

This invention relates.. to thermic telephonesl lits; object being toregulate the intensity of the sound \reproduction by varying the volumeof the sounding chamber. With this object in view, we so construct thesounding chamber that the parts inclosing it may be displaced relativelyto each other. We may also provide means for regulating the area of thesound openings in said sounding chamber.

Reference is to be had to the accompanying drawings in which Aourinvention is illustrated Aby way of example.

Figure 1 represents an enlarged sectional elevation of a thermictelephone according to our invention and adapted to be directlyintroduced into the auditory passage of the human ear, Fig. 2 is a planview of Fig.

section, a modified construction, provided with a separate yreceiveradapted 'to be 1ntroduced into the ear, Fig. 4 is a cross# section online A-B in Fig. 3, and Fig. 5 is a central longitudinal section of afurther modification.

Referring to Figs. '1V and 2` the heating conductors 1, which may be ofany suitable construction and electrically connected in any suitable'manner lare mounted on a support 2 held inposition within a tubularcasing 3 by meansof aplug 4 screwed into one end of the casing. Throughan opening in the bottom of the plug 4 the current conductors rand 6 arepassed. The tubular casing 3 is closed at the top by a cover 8 held inposition by aV pressed-in ring 9 and provided with a plurality ofapertures 7. A sleeve 10 is adapted to slide on said casing. The lowerrim of sleeve 10 has a collar 11 in which is a packing ring 12.

-The cover 13 of sleeve 10 has apertures 14 corresponding `in positionto the apertures 7 of cover 8. i

By pulling out the sleeve 10 inthe manner of a telescope t-he volumeofthe sounding chamber may be increased or .reduced as e modified sothat the covers 13 and 8 remain` engaged for any position of sleeve.10'. This may be done, for instance, as shown in Fig. 5 where thesleeve 10 slides on the lcasing 3'pas in Fig. 1,7but the upper endof thecasing opensdirectly` into the sleeve, and the latter has a small plate8 pivoted to it, the apertures 7 of this ,plate registering more or lessw1th theapertures of the sleeve head 13 as the plate is turned, whichmay be eii'ected bymeans 'of the projecting pivot pin.

Withthe described improvedconstruction, by which the volume of tlifsound chamber Patented Jan. "7, 1919.

as well as the area of thezp'assages forthe sound waves can beregulated, the sound ei'ect of the thermicteleph'one can readily beadapted to any requirements within wide limits. v e l A somewhatmodified construction is shown in Figs. 3 and 4, in which the tubularcasing 20 contains a plurality of superimposed groups of heating`conductors 17 mounted on supports 18 which are secured in place withinthe casing 20 by a 'screw plug 30 similarly as described with referenceto Fig. 1. On the casing 20 a slidable sleeve 21 is guided. At its uppertached a iiexible tube 27 terminating in a' The latter isadapted to .be'

receiver 28. introduced into the auditory passage ofthe Y. and heatinghuman ear. By sliding the sleeve 2l on the casing 20, the volume of thesounding chamber may be increased and reduced, as desired.

The' particular arrangement and connection of the heating conductors, aswell as the method of securing them to their support, have no bearing onour present invention.

le claim:

1. In a thermic telephone, a casing, heating conductors within saidcasing, a sound- 'ing chamber, and means for varying the volume of s aidsounding chamber.

2. In a thermic telephone, a casino', heating conductors Within saidcasing, a sounding chamber, and means adapted to slide on said casingtorvarying the volume ot' said sounding' chamber.

3. In a thermic telephone,a casing, heating conductors within saidcasing, a sounding chamber and a sleeve adapted to slide on said casing.

4. In a thermic telephone, a casing, heating conductors Within saidcasing, a sounding chamber, means for varying the volume ofsaid soundingchamber, apertures for thel passage of the sound waves, and means tor"varyino' the area of said apertures.

5. In a thermic telephone, the combination of a casing containing' asounding' chamber conductors cooperating with said sounding chamber.with ar sleeve slidably mounted on the casing and having' a perforatedtop for the passage ot' the sound Waves.

6. In' a thermie telephone, the combinat-ion of a casingeontaining asounding chamber and heating conductors coperating with saidv soundingchamber, with a sleeve having a perforated top for the passage of thesound waves, said sleeve being mounted on the casing and adapted toslide thereon longitudinally and thereby to increase the Volume of thesounding chamber,

mal means for limiting the sliding' movemeut of said sleeve.

T. In a thermic telephone, theJ combination of a casing containing asounding chamber and heatingconductors coperating with said soundingChamber, with a sleeve havingapertures at the top for the passage ot'the sound waves, said sleeve being mounted onthe casing and adapted toslide longitudinally thereon, and thereby to increase the volume of thesounding chamber, means for ,guiding said sleeve on said casing, saidmeans being adapted to form a tight joint between said casing and saidsleeve, and means for limiting the sliding movement oi said sleeve.

8. In a thermic telephone, the combination of a easing having aperforated top and containing a sounding chamber and heating conductors,with a sleeve adapted to slide and to turn on saidV casing and havingz aperforated top, the perforations of which are adapted to register withthe perforations in the top of said casing.

t). A thermic telephone, comprising in combination, heating` conductors,a support t'or same, a casing within which said heating conductorsupporty is mountedin such a position that a soundingr chamber is formedin front of the heatingl conductors, a screw plug' for holding saidsupport in position within said casing, means for connecting' theheating;- conductors to the current conductors, a perforated top plateon said casing, a sleeve adapted to slide and to turn on said casi-ng, atop plate on said sleeve, adapted to rest on the top plate of saidcasing and having` perforations arranged to `register with theperforations in the'top plate of said casing.'

In testimony whereof, We have signed this specification.

PIETER DE LANGE. ROBERT AERNOUT BARON VAN LINDEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner o! Patente. Washington, D. C.

